$ git clone -n https://src.fedoraproject.org/rpms/deepin-wallpapers.git /var/lib/mock/f38-build-side-42-init-devel-1172272-30612/root/chroot_tmpdir/scmroot/deepin-wallpapers
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1172272-30612/root/chroot_tmpdir/scmroot/deepin-wallpapers'...
$ git fetch origin d3ad96f0c13a9279717b5d09ad2058f888ad05d2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/deepin-wallpapers
 * [new ref]         d3ad96f0c13a9279717b5d09ad2058f888ad05d2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d3ad96f Rebuilt for f38-backgrounds